摘要 |
A magnetic resonance (MR) detection configuration comprising at least one RF resonant circuit ( 1 ) with an inductance (L), a preamplifier module ( 2 ) and an RF receiver ( 7 ), wherein a reactive transformation circuit is connected between a high-impedance point (M) of the inductance (L) and a low-impedance connecting point (A) of the RF resonant circuit ( 1 ), which acts as an impedance transformer and wherein the low-impedance connecting point (A) is connected to the preamplifier module ( 2 ) via an RF line ( 15 ) having a characteristic impedance R<SUB>W</SUB>), is characterized in that at least one passive damping impedance (Z<SUB>DV</SUB>, Z<SUB>SV</SUB>, Z<SUB>DV'</SUB>, Z<SUB>SV'</SUB>) is provided in the preamplifier module ( 2 ) downstream of the RF line ( 15 ), wherein the passive damping impedance (Z<SUB>DV</SUB>, Z<SUB>SV</SUB>, Z<SUB>DV'</SUB>, Z<SUB>SV'</SUB>) can be connected to the resonant circuit ( 1 ) by a switching means during a damping and/or transmitting process, and wherein the respective amount of the complex reflection factor of passive damping impedance (Z<SUB>DV</SUB>, Z<SUB>SV</SUB>, Z<SUB>DV'</SUB>, Z<SUB>SV'</SUB>) relative to the characteristic impedance R<SUB>W</SUB>) of the RF line ( 15 ) exceeds a value of 0.5. This presents an MR detection configuration with an extensive damping concept, wherein all three processes (transmitting, damping and receiving processes) are optimized.
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